8'1"
He Pingping (L) of China stands at 2'5", and is the shortest living man in the world, and Sultan Kosen of Turkey, at 8'1", is the tallest living man in the world. Both are in the Guinness World Records for their statures.

Photo: Getty Images

8'11"Khagendra Thapa Magar, the world's smallest teen, is held next to a life-sized figure of Robert Wadlow--the world's tallest man ever who died in 1940, and towered at 8' 11"--to mark his introduction into "Ripley's Believe It or Not" latest book during a photo shoot in New York on September 7, 2010. The Nepalese 17-year old made his entry into the record book as the world's smallest male teen standing just 22-inches tall.